Please help me with these physics/math problems. (desperate)

1.

A tennis ball with a velocity of 10.9 m/s to

the right is thrown perpendicularly at a wall.

After striking the wall, the ball rebounds in

the opposite direction with a velocity of −9.87

m/s to the left.

If the ball is in contact with the wall for

0.011 s, what is the average acceleration of

the ball while it is in contact with the wall?

Answer in units of m/s

2

You and a friend each drive 44 km to the

same destination. You travel at 89.2 km/h

and your friend at 95.9 km/h.

How long will your friend wait for you at

the end of the trip?

Answer in units of min

3.

The average speed of an orbiting space shuttle

is 21100 mi/h. The shuttle is orbiting about

248 mi above the Earth’s surface. Assume the

Earth’s radius is 3963 mi.

How long does it take to circle the earth?

Answer in units of h

please help me i would be really grateful ps answer in thousandths place

Re: Please help me with these physics/math problems. (desperate)

1) acceleration is change in velocity per time

2) find the time it takes you to drive 44 km and the time it takes your friend to drive 44 km

3) Figure out the radius of its orbit then find the circumference of its orbit, work from there.

Re: Please help me with these physics/math problems. (desperate)

Quote:

Originally Posted by

**lazimlite** 1.

A tennis ball with a velocity of 10.9 m/s to

the right is thrown perpendicularly at a wall.

After striking the wall, the ball rebounds in

the opposite direction with a velocity of −9.87

m/s to the left.

If the ball is in contact with the wall for

0.011 s, what is the average acceleration of

the ball while it is in contact with the wall?

Answer in units of m/s

2

You and a friend each drive 44 km to the

same destination. You travel at 89.2 km/h

and your friend at 95.9 km/h.

How long will your friend wait for you at

the end of the trip?

Answer in units of min

3.

The average speed of an orbiting space shuttle

is 21100 mi/h. The shuttle is orbiting about

248 mi above the Earth’s surface. Assume the

Earth’s radius is 3963 mi.

How long does it take to circle the earth?

Answer in units of h

please help me i would be really grateful ps answer in thousandths place

Please ask one question at a time. Thanks.

For the first question you will need to apply conservation of momentum.